I've been nauseous and there up once yesterday twice,my periods two weeks late, i've been having clear discharge. i was on birth control 4 months ago?

Take pregnancy test: While your symptoms may NOT be due to being pregnant, it is the quickest/easiest thing to be able to exclude, right? Based upon your question, I cannot understand whether you WERE on the pill 4 months ago, or still ARE on the pill. But even if you are, there is still a chance that you are pregnant. Please do a home pregnancy test. Best of luck.